Aerial View Maps

Science ?s about magnets/maps?

1. explain the differance between magnetic north and true north 2.when using a compass and a map, why is it important to adjust the compass for an areas magnetic declination? 3.how can you use a ruler or even a slip of paper to tell distances on a map? 4.what are topographic maps and how do they work? 6.how can you tell if there is a really steep slope on a topo map?

Public Comments

1. 1. A magnetic compass points to magnetic North. Magnetic North is not the same as geographic North. Over time magnetic North moves around. The North magnetic Pole is slowly drifting across the Canadian Arctic. The Geological Survey of Canada keeps track of this motion by periodically carrying out magnetic surveys to redetermine the Pole's location. A survey in May, 2001 established that it is moving approximately northwest at 40 km per year. 2. The map shows geographic North. The lines of magnetic declination show the magnetic compass error by which a bearing should be corrected 3. Mark off the map scale on the pied of paper or locate it on the ruler. You can then figure distances form that reference 4. Topo maps show contour lines of equal elevation so you know how high points on the lines are above sea level 5. The contour lines representing different elevations are close together